You can speak louder. But the problem is in your mind. I've been a speech class for a while and I saw many many cases just like you.
People who can't speak louder. Mostly their problem is a misconception. They don't speak loud because somebody would judge him badly.
It's a illogical misconception. Nobody blame you for specking loud. If you are a men it's mostly recommended.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.